ZIRCON U-Pb AGES FOR RHYOLITIC TUFFS OF THE NAOCANGJIANGOU FORMATION IN THE EAST KULUN OROGENIC BELT AND THEIR IMPLICATION
-
摘要:
应用激光烧蚀多接收器电感耦合等离子体质谱(LA-MC-ICP MS)方法对东昆仑秀沟盆地闹仓坚沟组火山岩样品进行了锆石U-Pb定年研究。流纹质凝灰岩(DG25-4)中锆石的阴极发光图像具有振荡环带结构，属于典型的岩浆锆石。15个岩浆锆石206Pb/238U表面年龄集中在239~249 Ma之间，206Pb/238U加权平均值为243.5 ± 1.7 Ma，它记录了火山岩的形成年龄，说明该地区闹仓坚沟组形成于中三叠世早期。这一研究还在闹仓坚沟组火山岩中发现了早古生代和元古宇继承锆石，提供了昆南地体可能存在元古宇基底的信息。
Abstract:By using La-Mc-ICPMC method, accurate zircon U-Pb dating has been made for volcanic rock samples from the Naocangjiangou Formation in the Xiugou basin of the East Kunlun orogenic belt. The zircons from the rhyolitic tuff (sample DG25-4) showed oscillatory girdles in its cathodeluminescence image, indicating a typically magmatic origin. The 206Pb/238U surface ages of 15 magmatic zircons are concentrated in the range of 239-249 Ma, averaging 243.5 ± 1.7 Ma, which records the forming age of those volcanic rocks, that is, the Naocangjiangou Formation was formed in the early Middle Triassic. Early Paleozoic and Proterozoic zircons were also found in volcanic rocks of the formation, suggesting the possible presence of Proterozoic basement in the Kunlun southern terrain.
-
Key words:
- Naocangjiangou Formation /
- tuffs /
- U-Pb age /
- Middle Triassic /
- East Kulun orogenic belt
-
-
表 1 凝灰岩锆石LA-MC-ICP MS U-Pb同位素年龄测定结果
Table 1. LA-MC-ICP MS U-Pb data for zircons from the tuffs in Naocangjiangou Formation
下载: 导出CSV
-
[1] 倪晋宇, 胡道功, 周春景.东昆仑造山带纳赤台群形成的大地构造环境探讨[J].地质力学学报, 2010, 16(1) : 11~20. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100102&journal_id=dzlxxb
NI Jin-yu, HU Dao-gong, ZHOU Chun-jing. Discussion on tectonic environment of Naij Tal Group, East Kunlun Orogenic Belt[J]. Journal of Geomechanics, 2010, 16(1) : 11~20. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100102&journal_id=dzlxxb
[2] 周春景, 胡道功, Barosh P J, 等.东昆仑三道湾流纹英安斑岩锆石U-Pb年龄及地质意义[J].地质力学学报, 2010, 16(1) : 28~35. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100104&journal_id=dzlxxb
ZHOU Chun-jing, HU Dao-gong, Barosh P J, et al. Zircon U-Pb dating of the rhyolite-dcite porphyry in the Sandaowan of east Kunlun MTS and its geological significance[J]. Journal of Geomechanics, 2010, 16(1) : 28~35. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100104&journal_id=dzlxxb
[3] 陆露, 胡道功, 张永清, 等.昆中断裂带同构造花岗斑岩锆石U-Pb年龄及构造意义[J].地质力学学报, 2010, 16(1) : 36~43. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100105&journal_id=dzlxxb
LU Lu, HU Dao-gong, ZHANG Yong-qing, et al. Ziron U-Pb age for syntectoin granitic porphyry and its teceonic significance in the middle Kunlun fallt belt[J]. Journal of Geomechanics, 2010, 16(1) : 36~43. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100105&journal_id=dzlxxb
[4] 张紫程, 张绪教, 高万里, 等.东昆仑左行韧性剪切带形成时代的锆石U-Pb年龄证据[J].地质力学学报, 2010, 16(1) : 51~58. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?file_no=20100107&flag=1
ZHANG Zi-cheng, ZhANG Xu-jiao, GAO Wan-li, et al. Evidence of zircon U-Pb ages for the formation time of the east Kunlun left-lateral ductile shear belt[J]. Journal of Geomechanics, 2010, 16(1) : 51~58. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?file_no=20100107&flag=1
[5] 张耀玲, 张绪教, 胡道功, 等.东昆仑造山带纳赤台群流纹岩SHRIMP锆石U-Pb年龄[J].地质力学学报, 2010, 16(1) : 21~27, 50. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100103&journal_id=dzlxxb
ZHANG Yao-ling, ZHANG Xu-jiao, HU Dao-gong, et al. SHRIMP-based zircon U-Pb ages for rhyolite of the Naij Tal Group in the east Kulun orogenic belt[J]. Journal of Geomechanics, 2010, 16(1) : 21~27, 50. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100103&journal_id=dzlxxb
[6] 薛腊梅, 赵希涛, 张耀玲, 等.遥感技术在东昆仑新生代地质填图中的应用[J].地质力学学报, 2010, 16(1) : 70~77. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100109&journal_id=dzlxxb
XUE La-mei, ZHAO Xi-tao, ZHANG Yao-ling, et al. Application of remote sensing technique in the east Kunlun Cenozoic geological mapping[J]. Journal of Geomechanics, 2010, 16(1) : 70~77. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100109&journal_id=dzlxxb
[7] 高万里, 张绪教, 王志刚, 等.基于ASTER遥感图像的东昆仑造山带岩性信息提取研究[J].地质力学学报, 2010, 16(1) : 59~69. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100108&journal_id=dzlxxb
GAO Wan-li, ZHANG Xu-jiao, WANG Zhi-gang, et al. ASTER remote sensing image-based lithologic information extraction of the east Kulun orogenic belt[J]. Journal of Geomechanics, 2010, 16(1) : 59~69. http://journal.geomech.ac.cn/ch/reader/view_abstract.aspx?flag=1&file_no=20100108&journal_id=dzlxxb
[8] 青海省地质矿产局.青海省岩石地层[M].武汉:中国地质大学出版社, 1997. 142~172.
Bureau of Geology and Mineral Resources of Qinghai Province. Stratigraphy (lithostratic) of Qinghai Province[M]. Wuhan: China University of Geosciences Press, 1997. 142~172.
[9] 许志琴, 杨经绥, 李海兵, 等.造山的高原---青藏高原地体的拼合、碰撞造山及隆升机制[J].北京:地质出版社, 2007. 1~458.
XU Zhi-qin, YANG Jing-sui, LI Hai-bing, et al. Orogenic plateau: Terrane amalgamation, collision and uplift in the Qinghai-Tibet Plateau[M]. Beijing: Geological Publishing House, 2007. 1~458.
[10] 李荣社, 计文化, 赵振明, 等.昆仑早古生代造山带研究进展[J].地质通报, 2007, 26(4) : 373~381. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=zqyd200704001&dbname=CJFD&dbcode=CJFQ
LI Rong-she, JI Wen-hua, ZHAO Zhen-ming, et al. Progress in the study of the Early Paleozoic Kunlun orogenic belt[J]. Geological Bulletin of China, 2007, 26(4) : 373~381. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=zqyd200704001&dbname=CJFD&dbcode=CJFQ
[11] 李怀坤, 耿建珍, 郝爽, 等.用激光烧蚀多接收器等离子体质谱仪(LA-MC-ICP MS)测定锆石U-Pb同位素年龄[J].矿物岩石地球化学通报, 2009, 28(增刊) : 77. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kwxb2009s1311&dbname=CJFD&dbcode=CJFQ
LI Huai-kun, GENG Jian-zhen, HAO Shuang, et al. Research on the dating zircon U-Pb age by LA-MC-ICP MS[J]. Bulletin of Mineralogy, Petrology and Geochemistry, 2009, 28(Supp.) : 77. http://kns.cnki.net/KCMS/detail/detail.aspx?filename=kwxb2009s1311&dbname=CJFD&dbcode=CJFQ
[12] 张雪亭, 杨生德.青海省区域地质概论[M].北京:地质出版社, 2007. 54~72.
ZHANG Xue-ting, YANG Sheng-de. The regional geology of Qinghai Province[M]. Beijing: Geological Publishing House, 2007. 54~72.
[13] Wan Y S, Yang J S, Xu Z Q, et al. Geochemical characteristics of the Maxianshan Complex and Xinglongshan Group in the eastern segment of the Qilian orogenic belt[J]. Journal of the Geological Society of China, 2000, 43(1) : 52~68. https://www.researchgate.net/publication/279655755_Geochemical_characteristics_of_the_Maxianshan_Complex_and_Xinglongshan_Group_in_the_eastern_segment_of_the_Qilian_orogenic_belt
-
图(4)
表(1)
计量
- 文章访问数: 438
- PDF下载数: 5
- 施引文献: 0